Yes, they exist:
http://www.charge-amps.com/spark/
I have one of these, very useful, light weight and adjustable, 6 A, 10A and 16A.
6A is perfect if you don`t know the status of the outlet. If you what to draw 16A out of a Schucko-outlet (EU domestic) it must be wired with 2,5 mm2 cables.
My...